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Experimental Study on Heat Transfer Characteristics of HFC134a for Enhanced Tubes Used in a Flooded Evaporator  

Yang, Seung-Woo (Graduate School, Kyung Hee University)
Lee, Young-Su (Korea Institute of Energy Research)
Jeong, Jin-Hee (LS Cable Ltd.)
Kang, Yong-Tae (School of Mechanical and Industrial System Engineering, Kyung Hee University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.18, no.12, 2006 , pp. 971-976 More about this Journal
Abstract
The objectives of this paper are to study the characteristics of pool boiling heat transfer for enhanced tubes used in the evaporator of turbo chiller and to provide a guideline for optimum design of an evaporator using HFC134a. Three different enhanced tubes are tested at 4 different saturation temperatures. The wall super heated temperature difference ranges from $0.5^{\circ}C\;to\;3.5^{\circ}C$. The refrigerant, HFC134a evaporates on the outside of the tube while the chilled water flows inside the tube. This study provides experimental heat transfer coefficients for evaporation on the enhanced tubes. It is found that the turbo-II tube provides the highest heat transfer coefficient.
Keywords
Evaporator heat transfer; Enhanced tube; Flooded evaporator; Reentrant cavity; HFC134a(R-l34a);
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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